St. Estephe not only borders Pauillac, but some of the vineyards abut Chateau Lafite Rothschild from Pauillac. In fact, at one time, some of the vineyard land belonging to Chateau Lafite Rothschild were located in St. Estephe. Lafite Rothschild was forced to lobby and persuade the ruling body to change the St. Estephe boundaries, so those vines could be included in the wine of Chateau Lafite Rothschild!Only five wines from St. Estephe were included in the original 1855 classification. Those classified vineyards make up about 20% of the entire St. Estephe appellation. That is less than every other commune in the Left Bank. In the 1855 Classification, the top two chateaux of Saint Estephe, are the same top two wines of the appellation today, Cos d’Estournel and Montrose. Interestingly, some people claim Chateau Montrose is a better expression of St. Estephe, while Chateau Cos d’Estournel is the more modern styled wine.
Click here for more info
With thanks to Jeff Leve from http://www.thewinecellarinsider.com, for the invaluable information